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Question

For a cell to produce a current, the electrodes of the cell must
  1. Be at two different temperatures
  2. Have a potential difference
  3. Be exposed to light
  4. Be in a liquid

A
Have a potential difference
B
Be in a liquid
C
Be exposed to light
D
Be at two different temperatures
Solution
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Current flows in a circuit having a cell only when the electrodes of the cell have finite potential difference.

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